Rippowam River

{{Short description|River in Connecticut and New York, US}}

{{Use American English|date=February 2025}}

File:PostcardStamfordCTRailroadBrOverMillRiver1908.jpg, about 1908]]

The Rippowam River is a river in Fairfield County, Connecticut and Westchester County, New York (United States). It drains a catchment area of {{convert|37.5|mi2|km2}} and flows for {{convert|17|mi|km}} from Ridgefield to Long Island Sound, which it enters in Stamford's harbor.Martin Silva, [https://web.archive.org/web/20110607163421/http://www.nae.usace.army.mil/projects/ct/millriver/finalappendixc.pdf Mill River and Mill Pond Habitat Restoration Project, Rippowam River, Stamford, Connecticut: Geotechnical Analysis], Bioengineering Group, Inc., for U.S. Army Corps of Engineers, May 2003

Streamflow in the Rippowam River is controlled by several small dams.[http://ct.water.usgs.gov/apache/station.data/01209901.2002.sw.pdf 01209901 RIPPOWAM RIVER NEAR STAMFORD, CT], U.S. Geological Survey The Turn-of-River Bridge, which is listed on the National Register of Historic Places, crosses it.{{NRISref|2009a}} The river has been dammed to form both the North Stamford Reservoir in North Stamford, and the Laurel Reservoir on the Stamford/New Canaan border.

The lower eight miles of Rippowam River, from the North Stamford Reservoir to Harbor Point (Stamford), are known as Mill River according to the Trust for Public Land, although U.S. Geological Survey maps and documents based on them don't reflect this information.{{cite web |url=http://www.tpl.org/tier3_cd.cfm?content_item_id=19776&folder_id=261 |title=Mill River Park Plan, Stamford, CT |publisher=The Trust for Public Land |url-status=dead |archiveurl=https://web.archive.org/web/20110101045628/http://www.tpl.org/tier3_cd.cfm?content_item_id=19776&folder_id=261 |archivedate=2011-01-01 }} The upper part of the river, in Westchester County, is also called Mill River, as shown in USGS maps{{cite web | url=https://www.waterqualitydata.us/provider/NWIS/USGS-NY/USGS-01209797/ | title=MILL RIVER AT POUND RIDGE NY (USGS-01209797) site data in the }}{{cite web | url=https://caltopo.com/map.html#ll=41.07956,-73.55744&z=16&b=t | title=CalTopo - Backcountry Mapping Evolved }} Variant names for the Rippowam River include Mill River, Collins Brook, Mud Pond Brook, Rippowan River, Scotts Corner Brook, Stamford Mill River, Stoneford Mill River, Tomok River, and Turn River, according to the US Board on Geographic Names.{{cite web | url=https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/008e1f45-155b-5c97-b3ee-2f7c0c28b153/summary | title=Geographic Names Information System }}

Architect Philip Johnson built his Glass House on the eastern slope of the Rippowam River valley in New Canaan in the late 1940s to take advantage of the view of the valley formed by the river.